Scalar susceptibility and chiral symmetry restoration in nuclei

Details Scalar susceptibility and chiral symmetry restoration in nuclei Scalar susceptibility and chiral symmetry restoration in nuclei

2003-05-20

arxiv.org/abs/nucl-th/0305058v1

Phys.Rev.C68:035209,2003

Physics

Nuclear Physics

Nuclear Theory

17 pages, 5 figures

Scientific paper

10.1103/PhysRevC.68.035209

We study the nuclear modification of the scalar QCD susceptibility, calculated as the derivative of the quark condensate with respect to the quark mass. We show that it has two origins. One is the low lying nuclear excitations. At normal nuclear density this part is constrained by the nuclear incompressibility. The other part arises from the individual nucleon response and it is dominated by the pion cloud contribution. Numerically the first contribution dominates. The resulting increase in magnitude of the scalar susceptibility at normal density is such that it becomes close to the pseudoscalar susceptibility, while it is quite different in the vacuum. We interpret it as a consequence of chiral symmetry restoration in nuclei.

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